549 Dwell Tachometer, Operating Manual; Number 5490180; 1974. Manufactured by Rite Autotronics, 3485 South Cienega Boulevard, Los Angeles, California 90016. Dimensions are: 140 millimeters width by 227 millimeters height and weight 5.1 grams; 4 pages. Created by Gerard Arthus and released into the Public Domain under the Creative Commons Etext created by Gerard Arthus.
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